Cueva de Nerja

This long stretch of underground caverns just outside of Nerja is partially open to tourists. It's a cool visit, with a few big open chambers (one of which has been turned into a permanent amphitheater where they host regular concerts). The cave was inhabited as early as 25,000 BC and has cave art dating from as far back as 12,000 BC, unfortunately you can't visit the halls with the paleolithic art due to concerns about its preservation.
8.50 euros
Take a jacket or a coat!